(25) = Front axle service: Re-pack upper kingpin
roller bearing.
(26) = Air brake service:
• Inspect brake lines and hoses for proper
hook-up, binding, leaks, cracks, chafing,
etc. Inspect drum brake linings for wear or
cracks. Inspect other brake parts at each
wheel, including drums, wheel cylinders
and piston heat shields, boots and wheel
speed sensor wiring. Check brake pedal
for excessive free play or travel (or every
6 months, whichever occurs first) and have
serviced if needed. Check brakes more often if
driving habits and conditions result in frequent
braking. Replace air dryer cartridge only if
excessive oil or moisture is present. A small
amount of oil in the system is normal and
should not be considered as a reason to
replace the cartridge.
• Test air lines for leaks; tighten as needed.
Replace compressor filter.
• Inspect air parking brake chamber for leaks
and damage. Inspect lines and hoses for leaks,
cracks, chafing, etc. Also check all attachments
for tightness, wear, or damage. Note: The
spring brake section of the rear brake
diaphragms are non-serviceable.
• Replace the air compressor filter element,
mounted on the air compressor. For remote air
compressor intake service, refer to engine air
cleaner filter replacement.
• Remove, disassemble, clean, and inspect the
safety valve, service brake chambers, quick
release valve, quick release/double check
valve combination, parking brake control valve,
double check valve, pressure protection valve,
and ether injector.
• Remove, disassemble, and clean the
application valve; replace parts showing wear.
• Remove, disassemble, clean, and inspect
the spring brake control valve; replace
rubber parts.
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